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Strontium tetraborate glasses doped with transition metal ions: EPR and optical absorption study

机译:过渡金属离子掺杂的四硼酸锶玻璃:EPR和光吸收研究

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Electron paramagnetic resonance (EPR) and optical studies have been carried out on Cu(II)-, VO(II)- and Cr(III)-doped strontium tetraborate glasses to understand the distortion and substitution of these ions. The EPR results of Cu(II) glass indicate that g (parallel to) > g (perpendicular to), typical for the tetragonally elongated octahedral site of the Cu(II) impurity. The evaluated covalency parameter 0.788 suggests a moderate covalency for the bonding. By correlating EPR and optical results, the in-plane pi-bonding beta(2)(1) is evaluated as 0.715. In the vanadium-doped glasses, the distortion must be a tetragonally elongated octahedron, similar to Cu(II). However, the EPR studies show that g (parallel to) > g (perpendicular to) indicating the tetragonally compressed octahedral site for the ion. The site symmetry is C (4V). Supported by the optical absorption, evaluated parameters propose a moderate covalency. The EPR and optical results for Cr(III) glass indicate the distorted octahedral site symmetry in the host lattice. These results further suggest that the bonding between Cr(III) and the ligands is covalent.
机译:电子顺磁共振(EPR)和光学研究已经在掺Cu(II),VO(II)和Cr(III)的四硼酸锶玻璃上进行,以了解这些离子的畸变和取代。 Cu(II)玻璃的EPR结果表明g(平行)> g(垂直),这是Cu(II)杂质的四边形八面体位点的典型值。评估的共价参数0.788表示键合的中等价。通过关联EPR和光学结果,面内π键beta(2)(1)被评估为0.715。在掺钒玻璃中,变形必须是类似于Cu(II)的四边形八面体。但是,EPR研究表明,g(平行)> g(垂直)表示离子的四方压缩八面体位点。位置对称性为C(4V)。在光吸收的支持下,评估参数提出了适度的共价性。 Cr(III)玻璃的EPR和光学结果表明主体晶格中扭曲的八面体位对称。这些结果进一步表明Cr(III)与配体之间的键是共价的。

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